Malicious PDF — malware analysis report

Static analysis result for SHA-256 857207eb0410de77…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 20:09:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b59b1d6c66b80e0b91bf4a2e85eedcb2 SHA-1: 86b21191af192ae2134ad614b3ac49755eaa8093 SHA-256: 857207eb0410de779b8c53aa1b48cd7995ff78bed35e9827e4f3c6f4fba57ff2
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into downloading potentially unwanted software or visiting phishing sites, masquerading as game hacks and generators. The primary malicious link identified is http://netcdn.tw/app/479516143/how-to-download-minecraft-for-free-on-android-game-hack, which is part of a known malicious redirector infrastructure. The document also includes a mass external PDF link farm, suggesting a tactic to inflate search engine rankings for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/479516143/how-to-download-minecraft-for-free-on-android-game-hack In PDF document text
    • https://library.stikeswnpalu.ac.id/repository/fre-stuff-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-hack-no-verification-no-verification_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-glitch-no-waiting-no-inspect_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hack-para-anime-cross-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-hacks-and-cheats-that-work_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/csgo-hacker-id-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/hack-ser-inmortal-en-roblox_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-pro_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-secret-video-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-app-cheats_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-free-robux-online_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31BF 21788 bytes
SHA-256: 9916b3e51d5e059b6215a45c8dca6b202d60ef88216c29bb40acebbb9931396c
font_01_sfnt_off000061ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AE 18576 bytes
SHA-256: 533f93ab9dd02e28dde29d6843f0244f722ecb9b3db78d8904ab6a8c57640b5d

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